Science as we understand it nor at least, I mean the rules of science as we know them, could only be a sliver of a fraction of what the true rules of science is, as we're only at point where we're capable of understanding what we currently know. Who knows what else there is to learn yet...
Someone once said that if earth was to be visited by a race of beings with superior technology that could do things we thought was impossible, we would think of that as magic. Or something along those lines at least, I cant remember the quote word for word but thats the long and short of it. The point is that magic is just word.
As for Dreadnaught being capable of taking down Superman, I dont think so >>
He might be able to do that molecular manipulation stuff, but he would have to know all the properties of Kryptonite to be able to convert something into that and in the space of time it would take him to do that IF he knew all the properties of it would leave him open to attack from Super Man, who could zip in and shatter Dreads Control medal before you could blink and then zip out again. I'm well aware that Super Man is more then capable of being killed, but its not by Dreads hands. I think even Anubis would have difficulty taking Super Man down (although i'm not saying he couldnt kill him.)